        <tr class="detalle_row">
        <% fields_for "evaluacion[venta_attributes][]", venta do |v| %>
          <tr>
            <td><%= v.collection_select(:participante_id, @participantes, :id, :nombre_completo, {:include_blank => true}) %></td>
            <td><%= v.select(:marca_id, @marcas_select, {:include_blank => true}) %></td>
            <td><%= v.text_field(:venta_copas, :size => 5) %></td>
            <td><%= v.text_field(:venta_botellas, :size => 5) %></td>
          <% end %>
        </tr>                
